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1.2.1: Ejercicios 1.2
https://espanol.libretexts.org/Matematicas/Algebra_lineal/Fundamentos_del_%C3%81lgebra_Matricial_(Hartman)/01%3A_Sistemas_de_Ecuaciones_Lineales/1.02%3A_Usando_Matrices_para_Resolver_Sistemas_de_Ecuaciones_Lineales/1.2.01%3A_Ejercicios_1.2
$\begin{array}{rl} x_1 +3x_2-4x_3 + 5x_4 =&17 \\ -x_1+4x_3+8x_4 =&1\\ 2x_1+3x_2+4x_3+5x_4=&6 \end{array}$ $\left[\begin{array}{ccc} 3&-2&4\\ 2&0&3\\-1&9&8\\5&-7&13\\ \end{array}\right]$ \(\left[\b... $\begin{array}{rl} x_1 +3x_2-4x_3 + 5x_4 =&17 \\ -x_1+4x_3+8x_4 =&1\\ 2x_1+3x_2+4x_3+5x_4=&6 \end{array}$ $\left[\begin{array}{ccc} 3&-2&4\\ 2&0&3\\-1&9&8\\5&-7&13\\ \end{array}\right]$ $\left[\begin{array}{ccc} 1&2&3\\ -1&3&9\\ \end{array}\right]$ $A=\left[\begin{array}{ccc}{2}&{-1}&{7}\\{0}&{4}&{-2}\\{5}&{0}&{3}\end{array}\right]\nonumber$ $A=\left[\begin{array}{ccc}{1}&{1}&{1}\\{1}&{0}&{1}\\{1}&{2}&{3}\end{array}\right]\nonumber$

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